Analysis on the Stability of Supercavitation Projectile

Wei, Ping; Hou, Jian; Chen, Ting Feng

doi:10.4028/www.scientific.net/amm.157-158.58

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The research in Reference 2 shows that the supercavitating vehicle with a speed of 200 m/s has a significant damage effect at the end of the target. Wei et al 3 studied the navigation stability of supercavitating vehicles, and analyzed the stability equation to obtain the control parameters affecting the stability of supercavitating vehicles. By analyzing the underwater force of the vehicle, it can be obtained that under the condition that other conditions remain unchanged and only the position of the center of mass of the vehicle is changed, the center of mass of the vehicle moves forward, the lift arm is increased, the recovery torque is increased, the critical angle of attack is increased, and the critical speed is decreased.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the influence of centroid‐to‐buoyancy center ratio on the motion stability of supercavitating vehicle

Wei,

Wang,

Wang

2023

Concurrency and Computation

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SummaryIn order to study and solve the influence of the change of the position of the centroid of the supercavitating vehicle on the motion stability, the influence law of the position of the centroid of the supercavitating vehicle on the motion stability is found, and the quantitative criterion that can guide the design of the supercavitating vehicle is summarized. On the basis of theoretical analysis, the dynamic mesh technology combined with the volume of fluid multiphase flow model and the rigid body six degrees of freedom motion calculation model is used to carry out the supercavitating vehicle motion and supercavitating flow field coupling numerical simulation research for supercavitating vehicles with different cavitator shapes. The results show that the position relationship between the centroid position and the buoyancy position has a great influence on the motion stability of the vehicle. When the center of buoyancy is before the center of mass, the vehicle is unstable; when the center of buoyancy is behind the center of mass, the vehicle sails stably, and when the position of buoyancy action coincides with the center of mass, the amplitude of the tail beat of the vehicle is the smallest, and the navigation is the most stable, which is the best position of the centroid. In this article, the concept of centroid‐to‐buoyancy center ratio is proposed. The so‐called centroid‐to‐buoyancy center ratio refers to the ratio of the length from the centroid to the top of the head of the supercavitating vehicle to the length from the center of buoyancy to the top of the head of the vehicle. When the centroid‐to‐buoyancy center ratio fluctuates in the range of [0.8–1], it is an ideal condition for the stable navigation of the vehicle. When the centroid‐to‐buoyancy center ratio is in the range of (0, 0.8), the tail beat frequency is high, which accelerates the kinetic energy consumption and the rapid instability of the vehicle. Therefore, under the same constraint conditions, it is not that the closer the center of mass is, the better the stability of the vehicle motion is. The optimal centroid position is not a certain “point,” but a “periodic fluctuation interval” that changes with the buoyancy center.

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Section: Introductionmentioning

confidence: 99%

Numerical study on the influence of centroid‐to‐buoyancy center ratio on the motion stability of supercavitating vehicle

Wei,

Wang,

Wang

2023

Concurrency and Computation

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“…By analyzing the fluid dynamics of the supercavitating projectile, the nonlinear dynamic equation of motion is obtained. According to the stability equation, the control parameters that affect the stability of the supercavitating projectile are obtained [4][5][6]. The movement process of a projectile after entering the water is usually divided into an initial stage and a tail shot stage.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Calculation of the Best Center of Mass for Supercavitating Projectile

et al. 2022

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Currently, the supercavitating projectiles mostly rely on experience or experimental results to test the shape of the projectile; however, the cost of the experiment is relatively high, and there is no specific criterion to judge whether the underwater projectile is stable. To solve the aforementioned problems, we study the motion stability and establish motion equations for supercavitating projectiles. Through theoretical analysis and simulation calculations, the optimal center of mass position is designed to optimize the motion performance of underwater supercavitating projectiles. We think this work can provide theoretical support for the optimal design of underwater supercavitating projectiles.

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